Isotopic compositions of asteroidal liquid water trapped in fluid inclusions of chondrites

Calcium isotopic compositions of chondrites

We report mass-dependent and mass-independent Ca isotopic variations in nine chondrites from three groups: carbonaceous, ordinary and enstatite chondrites. There is about 0.25‰ per amu, i.e., 1‰ in Ca/Ca, variation in chondrites: carbonaceous chondrites have the lightest Ca isotopes, enstatite chondrites have modeled bulk Earth like Ca isotopes, and ordinary chondrites are in between. The corre...

Titanium Isotopic Compositions of Refractory Inclusions from Several Cv3 and Ck3 Chondrites: Implications for Nebular Heterogeneity

Fluid evolution in CM carbonaceous chondrites tracked through the oxygen isotopic compositions of carbonates

The oxygen isotopic compositions of calcite grains in four CM carbonaceous chondrites have been determined by NanoSIMS, and results reveal that aqueous solutions evolved in a similar manner between parent body regions with different intensities of aqueous alteration. Two types of calcite were identified in Murchison, Mighei, Cold Bokkeveld and LaPaz Icefield 031166 by differences in their petro...

Oxygen Isotopic Compositions and Degree of Alteration of Cr Chondrites

Although hydrously altered, CR chondrites are among the most primitive samples of the solar nebula because of no evidence for thermal or shock metamorphism [1], high presolar grain abundances [2], and perhaps because of their solar refrac-tory lithophile/Mg ratios [3]. Previous O-isotope measurements showed that CR chondrites form a mixing line of slope ~ 0.7 with a rather large scatter [4]. We...

Iron Isotopic Compositions of Geological Reference Materials and Chondrites

High-precision iron isotopic compositions for Fe-bearing geological reference materials and chondrites with a wide range of matrices (e.g., silicates, oxides, organic-bearing materials) are reported. This comprehensive data set should serve as a reference for iron isotopic studies across a range of geological and biological disciplines for both quality assurance and inter-laboratory calibration...